Prolong battery life
If it seems you're always looking for a charger, there are steps you can take to reduce the power consumption of your device.
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Always charge the battery fully.
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When power saving mode is activated, device settings, such as Network mode and the screen saver, are optimised.
Press the power key 
, and select Activate power saving. To deactivate power saving mode, press the power key , and select Deactivate power saving.
Press and hold the menu key, swipe until the desired application is displayed, and select 
.
Sounds, themes, and effects
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Mute unnecessary tones, such as key tones.
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Use wired headphones, rather than the loudspeaker.
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Change the length of the time-out period after which the device display switches off.
Select Menu > Settings and Phone > Display > Light time-out .
Select Menu > Settings and Themes > General . To change the wallpaper, on the home screen, select Options > Change wallpaper .
Select Menu > Settings and Themes > General > Options > Theme effects > Off .
In the display settings, select Brightness.
Select Menu > Settings and Themes > Screen saver > None .
Network use
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If you are listening to music or otherwise using your device, but do not want to make or receive calls, activate the offline profile.
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Set your device to check for new mail less frequently.
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Use a WLAN connection to connect to the internet, rather than a packet data (GPRS or 3G) connection.
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If your device is set to use both GSM and 3G networks (dual mode), the device uses more power when searching for the 3G network.
Select Menu > Settings and Connectivity > Network > Network mode > GSM .
Select Menu > Settings and Connectivity > Bluetooth > Bluetooth > Off .
Select Menu > Settings and Connectivity > WLAN > Options > Settings > Show WLAN availability > Never .
Select Menu > Settings and Connectivity > Admin. settings > Packet data > Packet data connection > When needed .